With the default Ubuntu Oneiric UI is it possible to lock a window in place? That is to say, once the window is positioned I would like to press a designated "Lock" key or select a designated "Lock Window" menu item from some menu which causes the window to become unmovable, un-resizable and un-closable until I un-check a menu item.

If this is not possible with the default window manager, is there a package I can install that will add this feature? If there isn't, what is the most common alternative window manager that offers this feature?